Brake for turn-tables of dredges



(No Model.) 3 sheets-sheen 1.

3 J. K. HOWE.

. BRAKE FOR TURN TABLES 0F DREDGBS, &0.

Patented July 22, 1884-.

(No Model.) 3 Sheets-Sheet 2.

' J. K. HOWE.

BRAKE TURN TABLES OP DRBDGES, 65C.

No. 302,336. `Patented July 22, 1884.

3 Sheets-Sheet', 3.

(No Model.)-

J. K. HOWB.

BRAKE POR TURN TABLES OP DREDGBS,&0.

Patented July 22, 1884.

f//Q'f UNITED STATES PATENT JOHN K. HOwE, OE Tit-OY, NEWYOEK.

BRAKE FOR TURN-TABLES OF DREDGES, 84.0.

SPECIFICATION forming part of Letters Patent No. 302,336, dated July2K2, 1884:.

i Application filed January 3l, 1884. (No model.)

.To @ZZ whom it may con/cern.-

Beit known that I, J onN K. Howrz, of Troy, county of Rensselaer, andState of New York, have invented certain new and useful Improve ments inBrakes for Turn-Tables of Dredges, Src., of which the following is afull, clear, and exact description, reference being had to theaccompanying drawings, and to the letters of reference markedl thereon.

My invention has relation to appliances peculiarly adapted to dredgesand excavators wherein the load is capable of being swung toward oneside Or the other; but the improvements are likewise applicable inconnection with any other hoisting machinery wherein a turn-table isemployed.

The object of my invention is to assist the swinging of the load throughthe medium of the hoisting-chains by applying a brake or clutch toeither of the two hoisting-chains, or to either ofthe sheaves employedto guide said chains, as the circumstances of the case may require; andto attain this object my improvements involve certain novel and usefulpeculiarities of construction, relative arrangements or combinations ofparts,and principles of Operation, all of which will be herein rst fullydescribed, and then pointed out inthe claims.

ln the accompanying drawings,forming part of this specification, Figurelis a plan view of a portion of a turn-table of a dredge or excavatorshowing my improved bra-ke mechanism applied thereon and arranged foroperation in connection with the hoisting-chain sheaves. Fig. 2 is aside elevation showing one oi' the brake-shoes and its connections,arranged as in Fig. l. Fig. 3 is a plan view representing the brakeapplied and arranged for operation directly in connection with thehoisting-chains. Fig. 4C represents a plan and side View of thebrake-shoe shown in Fig. 3, but detached from the other parts. Fig. 5 isa plan view. Fig. 6 is a vertical section on line x x of Fig. 3.

In all these figures like letters of reference, wherever they occur,indicate corresponding parts.

A is the turntable, B B the two hoistingchains, C C vertical sheaves,and D D hori- Zontal sheaves forguiding said chains. These s turn-table;and in order to 4permit the load to swing, one ofthe chains is slaekenedor allowed to pay out while the other is wound up upon its drum. Theweight ofthe load varies with many circumstances, as does also itsposition,

and although it must and does swing in the direction required, itsmovements are not always steady or under suliicient control of theOperator o1x4 clipper-tender, nor are these swinging movements alwayscapable of being com menced at the desired instant, so that time may bemost advantageously economized. The use of the two hoistingchains andtheir sheaves upon the turn-table is prilnarily for the purpose ot'dispensing with separate swinging-engines or separate swingingappliances.

` To Obviate the disadvantages above indicated, and to secure perfectcontrol of the load at all times, and still dispense with theindependent swinging engines or appliances, I apply a brake or clutchwhich shall operate to connect the turn-table directly with one or theother of thetwo hoistingchains, or,what effects the rsame purpose,to'connect the turn-table with one Ortho other of the sheaves upon whichsaid chains run. l

E is a rock-shaft extending between two brake-shoes F F, arranged tobear upon the sheaves C G. These shoes may of course be of any pattern,and they are so hung upon the shaft or otherwise connected therewiththat when one is in engagement with its corresponding sheave the otherone will be entirely dis engaged from its sheave. rIhe shaft E isprovided at a convenient point with an arm, E, in connection with whichis a connectingrod, G, serving to communicate motion from a handlever,as H,suitably hinged upon the turn-table or elsewhere, and situated soas to be within IOO convenient reach of the operator. The shaft E isshown as journaled in suit-able boxes upon the frames which support thesheaves. By moving the hand-lever in one direction,one of the brake-shocs arrests the motion of its sheave, and by moving the lever in theopposite direction ythe other shoe arrests its sheave. By leaving thelever in its central position, both shoes are brought to'a point whereneither will touch its sheave, so that the turn-table may, if desired,bemoved by the load itself. Vhen either brakeshoe is brought to bear uponits sheave, the effectis to connect the turn-table with thehoisting-'chain on one side, and then, when the chain on that side ispulled or wound up,it"will force the turntable to swing, as required bythe principles of myinvention, and thus place its movements positivelyunder the control of the operator. The application of the brake to thesheaves necessitates the employment of what are known as bedded sheaves,so as to insure the proper holding or clamping of the chain or theproper union between them and the turn-table so as to avoid allslipping. The same effects and. purposes may be accomplished without theuse of bedded sheaves by applying the brakes directly to the chains, andthis direct application I have represented at Fig. 3, wherein the bar orrod E2 carries the shoes F I4", and is made to move longitudinally, thuscarrying one shoe or the other directly against the chain, or leavingboth free, as the Case may require. The longitudinal movement iseffected by supplying the rod E2 with a short 1ack,\vitl1 which apinion, a, is made to engage. This pinion is suitably axled upon theturn-table, and is turned or partially turned by the application to itsaxle Y of a wrench, bar, or crank, I), the latter being operated by ahandlcver and connecting-rod much the same as in the preceding form. Asthe pinion is turned it causes the required longitudinal movements ofthe shaft El, and the consequent application of the brake-shoes to thechain. The turn-table is thus turned or moved upon the same generalprinciples as in the case of the application of the brake to thesheaves, and thus the hoisting-chains are made to assist the swinging,when required, .or to accomplish the swinging entirely. Under thislatter construction the brake-shoes are hinged, as at c, and they forcethe chain more or less be otherwise mounted and arranged, the details oftheir construction being immaterial so long as they accomplish therequired work at the required times and for the purposes set forth.

At I I are the hinge-bolts, upon which the boom is connected with theturntable. Being constructed and arranged for Operation substantially inaccordance with the foregoing explanation, the improved brake will befound to admirably answer the purpose or object of the invention, aspreviously set forth.

Having now fully described my invention, what I claim as new, and desireto secure by Letters Patent, is-

l. A brake mechanism applied upon a turntable, and arranged to effect aunion between said table and the hoisting-chain, substantially asexplained, so that theY table may be moved or swung by the chain, forthe purposes and objects named.

' 2. In combination with a turn-table having the two hoisting-chainsapplied in connection therewith, the herein-described brake mechanismarranged to connect either chain with the turn-table,substantially asand for the purposes set forth.

3. In combination with a turn-table having the two hoisting-ehainsapplied in connection therewith, the herein-described brake mechanisinarranged to connect either chain with the turn-table, and to let bothchains go free vat the will of the operator,substantially as and for thepurposes explained.

4. The hoisting-chains, the turn-table, the sheaves mounted thereon andserving to guide 'said chains, and the brake mechanism,appliedsubstantially as explained, so as to connect the turn-table and chainsby arresting the movevment of the sheaves, combined and arranged

